Mandibular complete denture

Abstract

This invention provides a complete mandibular denture that suppresses the discomfort caused to patients by conventional elastic materials and can be stably adsorbed to the mandibular alveolar ridge. [Solution] The denture comprises a mandibular complete denture 1, a denture base 3, and a plurality of artificial teeth 2. The first base edge 6a of the denture base 3 is provided in an inverted U shape when viewed from the occlusal surface side. When the mandibular complete denture 1 is fitted to the mandible 30, a lingual compression portion 7 is provided in the lingual region 4c corresponding to the lingual frenulum 40, which protrudes labially from the first reference surface b1 corresponding to the third alveolar ridge mucosa 33c. The lingual compression portion 7 is configured to compress the third alveolar ridge mucosa 33c when the mandibular complete denture 1 is fitted to the mandible 30.

Description

Technical Field

[0001] The present invention relates to a complete lower denture.

Background Art

[0002] For example, Patent Document 1 discloses a method for stabilizing a complete lower denture base, which is characterized in that in order to make the complete lower denture base difficult to disengage, an elastic material extending further rearward or obliquely downward rearward from the rearmost part on the left and right lingual sides of the complete denture base presses the mucosal part outward to maintain stability.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the technique of Patent Document 1, since the mucosal part is pressed by an elastic material extending further rearward or obliquely downward rearward from the rearmost part on the left and right lingual sides of the complete denture base, there is a possibility of giving a sense of discomfort to the patient due to the elastic material.

[0005] The present invention has been made in view of such points, and an object thereof is to provide a complete lower denture that can suppress giving a sense of discomfort to the patient due to a conventional elastic material and can be stably adsorbed on the occlusal rim of the lower jaw.

Means for Solving the Problems

[0006] To achieve the above objective, the present invention provides a mandibular complete denture comprising a denture base and a plurality of artificial teeth arranged side by side on the top of the denture base, wherein, when the mandibular complete denture is fitted to the mandible, the surface of the denture base facing the alveolar ridge mucosa of the mandible is the mucosal surface, the surface opposite to the mucosal surface is the polished surface, the lingual boundary between the mucosal surface and the polished surface is the first base border, and the labial boundary between the mucosal surface and the polished surface is the second base border, the mucosal surface has a central region covering the first alveolar ridge mucosa, which is the apical portion of the alveolar ridge mucosa, a labial region covering the second alveolar ridge mucosa, which is the labial portion of the alveolar ridge mucosa, and a lingual region covering the third alveolar ridge mucosa, which is the lingual portion of the alveolar ridge mucosa, and the first base border is provided in an inverted U shape when viewed from the occlusal surface side, and when the mandibular complete denture is fitted to the mandible, the portion of the lingual region corresponding to the lingual frenulum The central portion of the lingual region in the left-right direction of the denture base The third alveolar ridge mucosa It roughly matches the contour shape. A lingual compression portion is provided that protrudes labially from the first reference plane, and the lingual compression portion is configured to compress the mucous membrane of the third alveolar ridge when the mandibular complete denture is fitted to the mandible. ret Yes, they are. [Effects of the Invention]

[0007] According to the present invention, it is possible to provide a mandibular complete denture that suppresses the discomfort caused to patients by conventional elastic materials and can be stably adsorbed to the alveolar ridge of the mandible. [Brief explanation of the drawing]

[0008] [Figure 1] This is a top view showing a complete mandibular denture according to an embodiment of the present invention. [Figure 2] This is a schematic end view of section II-II in Figure 1. [Figure 3] This is a bottom view showing a complete mandibular denture according to an embodiment of the present invention. [Figure 4] (a) is a schematic diagram showing the tray and impression material before they are used for molding in Step 1, and (b) is a schematic diagram showing the tray and impression material after they have been used for molding in Step 1. [Figure 5] (a) is a schematic diagram showing the second wax denture and other impression materials before they are used for impression taking in step 7, and (b) is a schematic diagram showing the second wax denture and other impression materials after they have been used for impression taking in step 7. [Figure 6] (a) and (b) are schematic diagrams showing step 10, (c) is a schematic diagram showing step 12, and (d) is a schematic diagram showing step 13. [Figure 7] (a) is a diagram corresponding to Figure 2 showing the first wax denture fabricated in step 4, (b) is a diagram corresponding to Figure 2 showing the second wax denture fabricated in step 5, (c) is a diagram corresponding to Figure 2 showing the mandibular complete denture fabricated in step 9, and (d) is a diagram corresponding to Figure 2 showing the mandibular complete denture fabricated in step 11. [Figure 8] This figure shows the mandibular complete denture according to an embodiment of the present invention in the process of being fitted into the patient's mandible. [Figure 9] This figure shows a complete mandibular denture according to an embodiment of the present invention fitted to the patient's mandible, with the patient's tongue residing in the oral cavity. [Figure 10] This figure shows a complete mandibular denture according to an embodiment of the present invention fitted to the patient's mandible, with the tip of the patient's tongue protruding from the oral cavity. [Figure 11] This is a figure equivalent to Figure 1 in the comparative example. [Figure 12] This is a modified version of Figure 2. [Modes for carrying out the invention]

[0009] Embodiments of the present invention will be described in detail below with reference to the drawings. Note that the following description of preferred embodiments is essentially illustrative.

[0010] Figure 1 shows a mandibular complete denture 1 according to an embodiment of the present invention. The mandibular complete denture 1 comprises a plurality of artificial teeth 2 and a denture base 3. In this embodiment, the following description will be based on the vertical, anterior-posterior, and lateral directions of the mandibular complete denture 1 when it is fitted to the mandible 30. The labial side coincides with the anterior side in the anterior-posterior direction, and the lingual side coincides with the posterior side in the anterior-posterior direction.

[0011] The multiple artificial teeth 2 include a left second molar 2a, a left first molar 2b, a left second premolar 2c, a left first premolar 2d, a left canine 2e, a left lateral incisor 2f, a left central incisor 2g, a right central incisor 2h, a right lateral incisor 2i, a right canine 2j, a right first premolar 2k, a right second premolar 2l, a right first molar 2m, and a right second molar 2n. In this embodiment, the multiple artificial teeth 2 are made of resin (for example, plastic).

[0012] As shown in Figure 2, the denture base 3 has an inverted U-shaped cross-section. The denture base 3 also has a lingual wing 3a extending vertically, a labial wing 3b extending vertically at a predetermined distance from the lingual wing 3a in the anterior-posterior direction, and a apex 3c extending in the anterior-posterior direction to connect the upper end portion of the lingual wing 3a and the upper end portion of the labial wing 3b. Multiple artificial teeth 2 are arranged in an inverted U-shape when viewed from the occlusal surface side (upper side) at the apex 3c of the denture base 3 (see Figure 1). In this embodiment, the denture base 3 is made of resin (for example, plastic).

[0013] A mucosal surface 4 is provided on the inner surface of the denture base 3. The mucosal surface 4 is the surface of the denture base 3 that faces the alveolar ridge mucosa 33 of the alveolar ridge 31 of the mandible 30 when the mandibular complete denture 1 is fitted to the mandible 30 (see Figure 9). Here, the alveolar ridge 31 is composed of alveolar bone (not shown) and alveolar ridge mucosa 33 that covers the alveolar bone (not shown). The alveolar ridge mucosa 33 has a first alveolar ridge mucosa portion 33a, which is the apex (apex) region, a second alveolar ridge mucosa portion 33b, which is the region labial (anterior) to the apex region (first alveolar ridge mucosa portion 33a), and a third alveolar ridge mucosa portion 33c, which is the region lingual (posterior) to the apex region (first alveolar ridge mucosa portion 33a) (see Figures 8 and 9).

[0014] Further, the mucosal surface 4 has a central region 4a that covers a first alveolar mucosal part 33a which is the top surface part (upper side surface part) of the alveolar mucosa 33, a lip side region 4b that covers a second alveolar mucosal part 33b which is the lip side surface part (front side surface part) of the alveolar mucosa 33, and a tongue side region 4c that covers a third alveolar mucosal part 33c which is the tongue side surface part (rear side surface part) of the alveolar mucosa 33, in a state where the lower complete denture 1 is attached to the mandible 30.

[0015] A polishing surface 5 is provided on the outer surface of the denture base 3. The polishing surface 5 is the surface on the opposite side of the mucosal surface 4 of the denture base 3 in a state where the lower complete denture 1 is attached to the mandible 30.

[0016] A floor edge 6 is provided at the boundary between the mucosal surface 4 and the polishing surface 5 of the denture base 3. The floor edge 6 has a first floor edge 6a provided at the lower end portion of the tongue side (rear side) and the tongue side floor flange 3a of the denture base 3, and a second floor edge 6b provided at the lower end portion of the lip side (front side) and the lip side floor flange 3b of the denture base 3 (see FIG. 2). In other words, the floor edge 6 has a first floor edge 6a which is the boundary on the tongue side between the mucosal surface 4 and the polishing surface 5, and a second floor edge 6b which is the boundary on the lip side between the mucosal surface 4 and the polishing surface 5.

[0017] The first floor edge 6a is provided in an inverted U shape when viewed from the occlusal surface side (upper side) (see FIG. 1). Also, the depth of the first floor edge 6a at the portion corresponding to the lingual frenum 40 (the portion corresponding to the left lateral incisor 2f, left central incisor 2g, right central incisor 2h, and right lateral incisor 2i) is set to be equal to the depth of the first floor edge 6a at the portion corresponding to the molars (the portion corresponding to the left second molar 2a, left first molar 2b, left second premolar 2c, left first premolar 2d, right first premolar 2k, right second premolar 2l, right first molar 2m, and right second molar 2n).

[0018] Further, a tongue side pressing part 7 capable of pressing the third alveolar mucosal part 33c is provided in the tongue side region 4c of the mucosal surface 4 of the denture base 3 in a state where the lower complete denture 1 is attached to the mandible 30 (see FIGS. 3 and 9).

[0019] Furthermore, the lingual compression portion 7 is provided to protrude labially (anteriorly) from the first reference plane b1 corresponding to the third alveolar ridge mucosa 33c. Here, the first reference plane b1 corresponding to the third alveolar ridge mucosa 33c means that the first reference plane b1 substantially matches the contour shape of the third alveolar ridge mucosa 33c (alveolar ridge 31) of the patient from whom the impression was taken.

[0020] Furthermore, the lingual compression portion 7 is located at a position closer to the lower side in the vertical direction. In this embodiment, the lingual compression portion 7 is located at the end on the side of the first base edge 6a.

[0021] Furthermore, as shown in Figure 3, the lingual compression portion 7 is located in the central part of the denture base 3 in the left-right direction. In other words, the lingual compression portion 7 is located in the part of the lingual region 4c that corresponds to the lingual frenulum 40. Note that Figure 3 shows a portion of the lingual frenulum 40 when the mandibular complete denture 1 is fitted to the mandible 30.

[0022] Furthermore, the lingual compression portion 7 is provided continuously along the alignment direction of the multiple artificial teeth 2, and is provided in the portions corresponding to the left lateral incisor 2f, left central incisor 2g, right central incisor 2h, and right lateral incisor 2i.

[0023] Furthermore, the lingual compression portion 7 is made of a softer material (cushioning material) than the denture base 3. In this embodiment, the material of the lingual compression portion 7 is, for example, biocompatible silicone rubber.

[0024] The labial region 4b of the mucosal surface 4 of the denture base 3 is provided with a labial compression portion 8 that can compress the second alveolar ridge mucosa 33b when the mandibular complete denture 1 is fitted to the mandible 30 (see Figures 3 and 9).

[0025] Furthermore, the labial compression portion 8 is provided to protrude lingually (posteriorly) from the second reference plane b2 corresponding to the second alveolar ridge mucosa 33b. Here, the second reference plane b2 corresponding to the second alveolar ridge mucosa 33b means that the second reference plane b2 substantially matches the contour shape of the second alveolar ridge mucosa 33b (alveolar ridge 31) of the patient from whom the impression was taken.

[0026] Furthermore, the labial compression portion 8 is located in a position closer to the lower side in the vertical direction. In this embodiment, the labial compression portion 8 is located at the end on the second bed edge 6b side.

[0027] Furthermore, as shown in Figure 3, the labial compression portion 8 is located in the central part of the denture base 3 in the left-right direction. In other words, the labial compression portion 8 is located in the part of the labial region 4b that corresponds to the lingual frenulum 40.

[0028] Furthermore, the labial compression portion 8 is provided in the portion of the labial region 4b corresponding to the lingual compression portion 7 in the vertical and horizontal directions. The labial compression portion 8 is configured to clamp the portion of the alveolar ridge 31 of the mandible 30 corresponding to the lingual frenulum 40 together with the lingual compression portion 7 in the anterior-posterior direction when the mandibular complete denture 1 is fitted to the mandible 30.

[0029] Furthermore, the labial compression portion 8 is provided continuously along the alignment direction of the multiple artificial teeth 2, and is provided in the portions corresponding to the left lateral incisor 2f, left central incisor 2g, right central incisor 2h, and right lateral incisor 2i.

[0030] Furthermore, the labial compression portion 8 is formed from a material (cushioning material) that is softer than the denture base 3. In this embodiment, the material of the labial compression portion 8 is, for example, biocompatible silicone rubber.

[0031] In this embodiment, the mandibular complete denture 1 is fitted by adhering its denture base 3 to the alveolar ridge mucosa 33 of the alveolar ridge 31. Here, adsorption means that the mucosal surface 4 of the denture base 3 is brought into close contact with the alveolar ridge mucosa 33 of the alveolar ridge 31, and the inside of the denture base 3 (between the alveolar ridge mucosa 33 and the mucosal surface 4) is subjected to a pressure state (negative pressure state) that is lower than the air pressure outside the denture base 3, thereby causing the mucosal surface 4 of the denture base 3 to adhere to the surface of the alveolar ridge mucosa 33 of the alveolar ridge 31.

[0032] Next, we will explain the method of fabricating (production method) the mandibular complete denture 1 using Figures 4 to 7.

[0033] (Step 1) The alveolar ridge 31 of the patient's mandible 30 is molded (impression taken) using the tray T and impression material M1 shown in Figure 4(a). Figure 4(b) shows the tray T and impression material M1 after they have been used to mold the alveolar ridge 31, with the shape of the alveolar ridge 31 transferred to the lower surface of the impression material M1. In this embodiment, the first reference surface b1 and the second reference surface b2 corresponding to the alveolar ridge mucosa 33 are configured to substantially coincide with the contour shape of the alveolar ridge mucosa 33 (alveolar ridge 31) molded in step 1. In other words, the first reference surface b1 corresponding to the third alveolar ridge mucosa portion 33c is configured to make surface contact with the third alveolar ridge mucosa portion 33c when the mandibular complete denture 1 without a lingual compression portion 7 is fitted to the mandible 30. Furthermore, the second reference surface b2 corresponding to the second alveolar ridge mucosa 33b means that when a mandibular complete denture 1 without a labial compression portion 8 is fitted to the mandible 30, the second reference surface b2 is configured to be in surface contact with the second alveolar ridge mucosa 33b.

[0034] (Step 2) In Step 1, plaster is poured into the molded tray T and impression material M1 to create a model.

[0035] (Step 3) Using an occlusal rim fabricated from a model, the patient's bite is recorded, and the biting position and tooth height are determined.

[0036] (Step 4) The model and the occlusal rim are mounted on the articulator, and multiple artificial teeth 2 are placed side by side on the occlusal rim to fabricate the first wax denture 60 (see Figure 7(a)).

[0037] (Step 5) A second wax denture 61 is fabricated by applying, for example, a compound whose main component is a thermoplastic resin to the portions of the first wax denture 60 corresponding to the lingual compression portion 7 and the labial compression portion 8, thereby forming a temporary lingual compression portion 17 and a temporary labial compression portion 18 (see Figure 7(b)).

[0038] (Step 6) A trial fitting is performed by attaching the second wax denture 61, fabricated in step 5, to the patient's mandible 30. At this time, it is checked whether the patient experiences any discomfort such as pain due to the pressure on the patient's alveolar ridge mucosa 33 by the temporary lingual compression part 17 and the temporary labial compression part 18. If the patient experiences any discomfort such as pain, the temporary lingual compression part 17 and the temporary labial compression part 18 are finely adjusted by filing them down. In step 6, it is checked whether the second wax denture 61 is properly adsorbed to the patient's alveolar ridge mucosa 33. If the second wax denture 61 is properly adsorbed to the patient's alveolar ridge mucosa 33, the process proceeds to step 7. On the other hand, if the second wax denture 61 is not properly adsorbed to the patient's alveolar ridge mucosa 33, the second wax denture 61 is modified until it is properly adsorbed.

[0039] (Step 7) As shown in Figure 5(a), the alveolar ridge 31 of the patient's mandible 30 is molded again (an impression is taken again) using the second wax denture 61, which has a temporary lingual compression portion 17 and a temporary labial compression portion 18, and the other impression material M2 applied to the second wax denture 61. Figure 5(b) shows the second wax denture 61 and the other impression material M2 after they have been used to mold the alveolar ridge 31, and the shape of the alveolar ridge 31 has been transferred to the other impression material M2.

[0040] (Step 8) In step 7, plaster is poured onto the second wax denture 61 and other impression material M2 to create another model (not shown).

[0041] (Step 9) Other models, the second wax denture 61, and other impression material M2 are embedded in plaster in a flask (not shown). Once the plaster hardens, the denture base portion (made of wax) of the second wax denture 61 and the other impression material M2 are removed from the flask. Next, the space left by the removal of the denture base portion (made of wax) and the other impression material M2 in the flask is filled with a paste-like resin (e.g., resin), and the resin is allowed to harden (polymerize) to produce the mandibular complete denture 1 shown in Figure 7(c). In other words, in step 9, the denture base portion of the second wax denture 61 is replaced from wax to resin (e.g., resin), and the other impression material M2 is replaced with resin (e.g., resin) to produce the mandibular complete denture 1 shown in Figure 7(c). The mandibular complete denture 1 has protrusions 19 corresponding to the temporary lingual compression portion 17 and the temporary labial compression portion 18, which are formed from the same material (e.g., resin) as the denture base 3.

[0042] (Step 10) A fitting jig 80 is prepared, comprising a first jig section 81 and a second jig section 82. Then, a ridge reference member 70, which has been made by applying plaster to the inner surface (mucosal surface 4 and surface of the convex portion 19) of the mandibular complete denture 1, is fixed to the first jig section 81. Next, after applying more plaster S to the second jig section 82, which is placed on a table or the like, the first jig section 81 is moved downward so as to press the multiple artificial teeth 2 of the mandibular complete denture 1, which is attached to the ridge reference member 70, against the other plaster S, thereby setting the first jig section 81 into the second jig section 82 (Figures 6(a) and 6(b)). By continuing in this set state until the other plaster S hardens, a core 85 with the tooth shapes of the multiple artificial teeth 2 of the mandibular complete denture 1 imprinted on it is made.

[0043] (Step 11) Remove the first jig portion 81 from the second jig portion 82. Next, remove the mandibular complete denture 1 from the alveolar ridge reference member 70 fixed to the first jig portion 81, and shave off the protruding portion 19 of the mandibular complete denture 1 (see Figure 7(d)).

[0044] (Step 12) A paste-like material 90 (for example, a material softer than the denture base 3, such as biocompatible silicone rubber) is applied to the portion of the mandibular complete denture 1 where the protrusion 19 has been removed. Next, the first jig portion 81 is placed on a table or the like, and the mandibular complete denture 1 is attached to the alveolar ridge reference member 70 fixed to the first jig portion 81 (see Figure 6(c)).

[0045] (Step 13) The second jig portion 82 is set into the first jig portion 81 so that the core 85 fixed to the second jig portion 82 fits with the multiple artificial teeth 2 of the mandibular complete denture 1, and the paste-like material 90 applied in step 12 is hardened in this set state (see Figure 6(d)). As a result, the convex portion 19, which is made of the same material as the denture base 3, is replaced with a lingual compression portion 7 and a labial compression portion 8, which are made of a softer material than the denture base 3, and the mandibular complete denture 1 is completed. The lingual compression portion 7 and the labial compression portion 8 are formed in the same shape as the convex portion 19, but the material is replaced from the same material as the denture base 3 (e.g., resin) to a softer material than the denture base 3 (e.g., biocompatible silicone rubber). For the sake of explanation, only the lingual compression portion 7 is shown in Figure 6(d) (the labial compression portion 8 is omitted). Furthermore, the completed mandibular complete denture 1 is attached to the patient's alveolar ridge 31 by the denture base 3 adhering to the alveolar ridge mucosa 33 of the mandible 30 (see Figures 8 and 9).

[0046] As described above, according to this embodiment, when the mandibular complete denture 1 is fitted to the mandible 30, a lingual compression portion 7 is provided in the lingual region 4c corresponding to the lingual frenulum 40, protruding labially from the first reference plane b1 corresponding to the third alveolar ridge mucosa 33c. The lingual compression portion 7 is configured to compress the third alveolar ridge mucosa 33c when the mandibular complete denture 1 is fitted to the mandible 30. Therefore, as in the conventional Patent Document 1, it is not necessary to press the mucosa with an elastic material that extends further posteriorly or posteriorly downward from the posterior rearmost part of the left and right lingual sides of the complete denture base. This makes it possible to suppress the discomfort caused to the patient by conventional elastic materials. In this embodiment, a lingual compression portion 7 is provided that protrudes labially from the first reference plane b1 corresponding to the third alveolar ridge mucosa 33c. However, experimental results have shown that even if the lingual compression portion 7 is provided in the lingual region 4c corresponding to the lingual frenulum 40, the patient is less likely to experience pain or other discomfort.

[0047] Furthermore, according to this embodiment, when the mandibular complete denture 1 is fitted to the mandible 30, the lingual compression portion 7 compresses the third alveolar ridge mucosa portion 33c, thereby preventing air from entering between the third alveolar ridge mucosa portion 33c of the alveolar ridge 31 and the lingual region 4c of the denture base 3 from the lingual side. In other words, the lingual compression portion 7 that compresses the third alveolar ridge mucosa portion 33c functions as a sealing portion that prevents air from entering between the third alveolar ridge mucosa portion 33c of the alveolar ridge 31 and the lingual region 4c of the denture base 3 from the lingual side. This makes it possible to maintain a negative pressure state between the alveolar ridge mucosa 33 of the alveolar ridge 31 and the mucosal surface 4 of the denture base 3, so that the mandibular complete denture 1 can be stably adsorbed to the alveolar ridge 31 of the mandible 30.

[0048] Furthermore, in this embodiment, when the tongue 41 is moved from a state where it is housed in the oral cavity (see Figure 9) to a state where the tip of the tongue 41 protrudes in front of the lip 37 (see Figure 10), the lingual frenulum 40, which extends in the anterior-posterior direction at the left-right central portion of the tongue 41, may move forward and diagonally upward. In this case, a force acts on the left-right central portion of the first base edge 6a of the mandibular complete denture 1 (the portion corresponding to the lingual frenulum 40) by the lingual frenulum 40, which tries to push the mandibular complete denture 1 upward. In other words, a force acts on the mandibular complete denture 1 by the lingual frenulum 40, which tries to tilt the mandibular complete denture 1 forward so that it moves away from the alveolar ridge 31. In contrast, in this embodiment, the lingual compression portion 7 compresses the third alveolar ridge mucosa 33c, making it difficult for the mandibular complete denture 1 to tilt forward relative to the alveolar ridge 31. Therefore, in this embodiment of the mandibular complete denture 1 equipped with a lingual compression portion 7, the mandibular complete denture 1 tilts forward, which prevents air from entering between the third alveolar ridge mucosa 33c of the alveolar ridge 31 and the lingual region 4c of the denture base 3 from the lingual side. This makes it possible to maintain a negative pressure state between the alveolar ridge mucosa 33 of the alveolar ridge 31 and the mucosal surface 4 of the denture base 3, thereby allowing the mandibular complete denture 1 to be stably adsorbed to the alveolar ridge 31 of the mandible 30.

[0049] Furthermore, in the comparative example shown in Figure 11, a triangular notch 10 is provided in the central part of the first base edge 6a in the left-right direction (corresponding to the lingual frenulum), making it easier for air to enter between the third alveolar ridge mucosa 33c of the alveolar ridge 31 and the lingual region 4c of the denture base 3 through the notch 10. As a result, in the comparative example shown in Figure 11, it becomes difficult to maintain a negative pressure state between the third alveolar ridge mucosa 33c of the alveolar ridge 31 and the lingual region 4c of the denture base 3, which can lead to unstable adhesion of the denture base 3 to the alveolar ridge mucosa 33 and the risk of the mandibular complete denture 1 coming loose. In contrast, the first base edge 6a of the denture base 3 in this embodiment is provided in an inverted U-shape when viewed from the occlusal surface side (upper side), making it more difficult for air to enter from the lingual side between the third alveolar ridge mucosa 33c of the alveolar ridge 31 and the lingual region 4c of the denture base 3 than in the comparative example shown in Figure 11. Therefore, in this embodiment, it is possible to stabilize the adsorption of the denture base 3 to the alveolar ridge mucosa 33 compared to the comparative example shown in Figure 11.

[0050] Furthermore, in this embodiment, since the lingual compression portion 7 is provided at the end on the first base edge 6a side, it is possible to more reliably suppress the intrusion of air between the third alveolar ridge mucosa 33c of the alveolar ridge 31 and the lingual region 4c of the denture base 3 from the lingual side.

[0051] Furthermore, in this embodiment, the plurality of artificial teeth 2 include a left lateral incisor 2f, a left central incisor 2g, a right central incisor 2h, and a right lateral incisor 2i, and the lingual compression portion 7 is continuously provided along the alignment direction of the plurality of artificial teeth 2 and is provided in portions corresponding to at least the left lateral incisor 2f, the left central incisor 2g, the right central incisor 2h, and the right lateral incisor 2i, so that the lingual compression portion 7 continuously compresses the left-right central portion of the third alveolar ridge mucosa 33 over a predetermined range. This makes it possible to more reliably suppress the intrusion of air from the lingual side between the third alveolar ridge mucosa 33c of the alveolar ridge 31 and the lingual region 4c of the denture base 3.

[0052] Furthermore, in this embodiment, the lingual compression portion 7 is provided to protrude labially from the first reference plane b1 corresponding to the third alveolar ridge mucosa 33c, thereby ensuring that the third alveolar ridge mucosa 33c is reliably compressed. This makes it possible to more reliably suppress the entry of air from the lingual side between the third alveolar ridge mucosa 33c of the alveolar ridge 31 and the lingual region 4c of the denture base 3.

[0053] Furthermore, in this embodiment, since the lingual compression portion 7 is made of a softer material than the denture base 3, it is possible to suppress the discomfort such as pain caused to the patient by compressing the third alveolar ridge mucosa 33c with the lingual compression portion 7. Moreover, since the lingual compression portion 7 is made of a softer material than the denture base 3, the lingual compression portion 7 can more easily adhere to the third alveolar ridge mucosa 33c, thereby improving its sealing performance. As a result, it is possible to more reliably suppress the intrusion of air between the third alveolar ridge mucosa 33c of the alveolar ridge 31 and the lingual region 4c of the denture base 3 from the lingual side.

[0054] Furthermore, in this embodiment, the labial region 4b is provided with a labial compression portion 8 that protrudes lingually from the second reference plane b2 corresponding to the second alveolar ridge mucosa portion 33b. The labial compression portion 8 is configured to compress the second alveolar ridge mucosa portion 33b when the mandibular complete denture 1 is fitted to the mandible 30, thereby preventing air from entering between the second alveolar ridge mucosa portion 33b of the alveolar ridge 31 and the labial region 4b of the denture base 3 from the labial side.

[0055] Furthermore, in this embodiment, the labial compression portion 8 is provided in the portion of the labial region 4b corresponding to the lingual compression portion 7, and is configured to clamp together with the lingual compression portion 7 the portion of the alveolar ridge 31 of the mandible 30 corresponding to the lingual frenulum 40 when the mandibular complete denture 1 is fitted to the mandible 30. This prevents the mandibular complete denture 1 from shifting from its position on the alveolar ridge 31. This eliminates the need to press the mucous membrane with an elastic material extending further posteriorly or posteriorly downward from the posterior rearmost portion of the left and right lingual sides of the complete denture base, as in the conventional Patent Document 1. Therefore, it is possible to prevent the patient from experiencing discomfort caused by conventional elastic materials. In this embodiment, the labial compression portion 8 is provided that protrudes lingually from the second reference plane b2 corresponding to the second alveolar ridge mucosa portion 33b, but experimental results have shown that even with the labial compression portion 8, the patient is less likely to experience pain or other discomfort.

[0056] In this embodiment, an example has been described in which the lingual compression portion 7 is provided at the end on the first base edge 6a side. However, the lingual compression portion 7 may also be provided at the top 3c side (upper side) of the lingual region 4c, or it may be provided at an intermediate portion in the vertical direction of the lingual region 4c.

[0057] Furthermore, although this embodiment describes an example in which the labial compression portion 8 is provided at the end on the second bed edge 6b side, the labial compression portion 8 may also be provided at the top 3c side (upper side) of the labial region 4b, or it may be provided at an intermediate portion in the vertical direction of the labial region 4b.

[0058] Furthermore, although this embodiment describes an example in which one lingual compression portion 7 is continuously provided along the alignment direction of the multiple artificial teeth 2, multiple lingual compression portions 7 may be arranged in parallel along the alignment direction of the multiple artificial teeth 2.

[0059] Furthermore, although this embodiment describes an example in which one labial compression portion 8 is continuously provided along the alignment direction of the multiple artificial teeth 2, multiple labial compression portions 8 may be arranged in parallel along the alignment direction of the multiple artificial teeth 2.

[0060] Furthermore, in this embodiment, an example has been described in which the lingual compression portion 7 is provided in the portion corresponding to the left lateral incisor 2f, left central incisor 2g, right central incisor 2h, and right lateral incisor 2i. However, the lingual compression portion 7 may also be provided in the portion corresponding to the left central incisor 2g or the right central incisor 2h, or in the portion corresponding to the left canine tooth 2e, left lateral incisor 2f, left central incisor 2g, right central incisor 2h, right lateral incisor 2i, and right canine tooth 2j.

[0061] Furthermore, in this embodiment, an example has been described in which the labial compression portion 8 is provided in the portion corresponding to the left lateral incisor 2f, left central incisor 2g, right central incisor 2h, and right lateral incisor 2i. However, the labial compression portion 8 may also be provided in the portion corresponding to the left central incisor 2g or the right central incisor 2h, or in the portion corresponding to the left canine tooth 2e, left lateral incisor 2f, left central incisor 2g, right central incisor 2h, right lateral incisor 2i, and right canine tooth 2j.

[0062] Furthermore, although this embodiment describes an example in which the labial compression portion 8 is provided in the portion of the labial region 4b corresponding to the lingual compression portion 7, the labial compression portion 8 may also be positioned offset from the lingual compression portion 7 in at least one of the vertical and horizontal directions.

[0063] Furthermore, although this embodiment describes an example where the lingual compression portion 7 is formed of biocompatible silicone rubber, other materials (cushioning materials) may be used as long as they are softer than the denture base 3.

[0064] Furthermore, although this embodiment describes an example in which the lingual compression portion 7 is formed from a material softer than the denture base 3, the lingual compression portion 7 and the denture base 3 may be formed from the same material (see Figure 7(c)).

[0065] Furthermore, although this embodiment describes an example where the labial compression portion 8 is formed of biocompatible silicone rubber, other materials (cushioning materials) may be used as long as they are softer than the denture base 3.

[0066] Furthermore, although this embodiment describes an example in which the labial compression portion 8 is formed from a material softer than the denture base 3, the labial compression portion 8 and the denture base 3 may be formed from the same material (see Figure 7(c)).

[0067] Furthermore, although this embodiment describes an example in which the lingual compression portion 7 and the labial compression portion 8 are formed from a material softer than the denture base 3, the lingual compression portion 7, the labial compression portion 8, and the denture base 3 may all be formed from the same material (see Figure 7(c)).

[0068] Furthermore, although this embodiment describes an example in which the mandibular complete denture 1 includes a lingual compression portion 7 and a labial compression portion 8, the labial compression portion 8 may be omitted, as shown in the modified example in Figure 12.

[0069] Furthermore, although this embodiment describes an example where the denture base 3 is made of resin, it may also be made of a material other than resin (for example, metal). [Industrial applicability]

[0070] This invention is suitable for mandibular complete dentures. [Explanation of Symbols]

[0071] 1. Mandibular complete denture 2. Artificial teeth 2f Left lateral incisor (lateral incisor) 2g Left central incisor (central incisor) 2h Right-side central endodontic treatment (central endodontic treatment) 2i Right lateral endodontic treatment (lateral endodontic treatment) 3 righteousness bed 4. Mucosal surface 4a Central Area 4b Labial area 4c Lingual area 5 Grinding surface 6 bedspread 6a First Bed 6b Bed 2 7 Lingual pressure part 8 Labial pressure area 30 Lower jaw 31 Jawline 33. Palatal ridge mucosa 33a First palatal ridge mucosa 33b Second palatal ridge mucosa 33c Third palatal ridge mucosa b1 First reference plane b2 Second reference plane

Claims

1. It is a complete lower denture, The denture comprises a denture base and a plurality of artificial teeth arranged side by side on the top of the denture base, When the mandibular complete denture is fitted to the mandible, the surface of the denture base facing the mandibular alveolar ridge mucosa is defined as the mucosal surface, the surface opposite to the mucosal surface is defined as the polished surface, the lingual boundary between the mucosal surface and the polished surface is defined as the first base edge, and the labial boundary between the mucosal surface and the polished surface is defined as the second base edge. The mucosal surface has a central region covering the first alveolar ridge mucosa, which is the apical portion of the alveolar ridge mucosa; a labial region covering the second alveolar ridge mucosa, which is the labial portion of the alveolar ridge mucosa; and a lingual region covering the third alveolar ridge mucosa, which is the lingual portion of the alveolar ridge mucosa. The first rim is provided in an inverted U shape when viewed from the occlusal surface side. In the state in which the mandibular complete denture is fitted to the mandible, the central portion of the denture base in the left-right direction of the lingual region, which corresponds to the lingual frenulum in the lingual region, is provided with a lingual compression portion that protrudes labially from the first reference plane which substantially coincides with the contour shape of the third alveolar ridge mucosa. The lingual compression portion is configured to compress the mucous membrane of the third alveolar ridge when the mandibular complete denture is fitted to the mandible, in a mandibular complete denture.

2. In the mandibular complete denture according to claim 1, The lingual compression portion is provided at the end of the first denture rim, in a mandibular complete denture.

3. In the mandibular complete denture according to claim 1 or 2, The aforementioned plurality of artificial teeth include left and right central incisors and lateral incisors, The lingual compression portion is provided continuously along the alignment direction of the plurality of artificial teeth and is provided in portions corresponding to at least the left and right central incisors and lateral incisors, in a mandibular complete denture.

4. In the mandibular complete denture according to claim 1 or 2, A mandibular complete denture in which the lingual compression portion is formed of a material softer than the denture base.

5. In the mandibular complete denture according to claim 1 or 2, The labial region is provided with a labial compression portion that protrudes lingually from the second reference plane corresponding to the second alveolar ridge mucosa, The mandibular complete denture is configured such that the labial compression portion can compress the second alveolar ridge mucosa when the mandibular complete denture is fitted to the mandible.

6. In the mandibular complete denture according to claim 5, A mandibular complete denture, wherein the labial compression portion is provided in the portion of the labial region corresponding to the lingual compression portion, and is configured to clamp together with the lingual compression portion the portion of the alveolar ridge of the mandible corresponding to the lingual frenulum when the mandibular complete denture is fitted to the mandible.

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